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Note Employee benefits (Aggregate status of the plans and the amounts recognized in the consolidated financial statements) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Change in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | $ 767,539 |  |
Fair value of plan assets at end of year | 685,823 | $ 767,539 |
Pension Plans |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 816,988 | 778,658 |
Service cost | 0 | 0 | $ 0
Interest cost | 25,493 | 25,889 | 26,558
Termination benefit cost | 0 | 0 | 0
Actuarial loss (gain) | (47,549) | 52,125 |
Benefits paid | (40,374) | (39,684) |
Benefit obligation at end of year | 754,558 | 816,988 | 778,658
Change in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 767,539 | 697,129 |
Actual return on plan assets | (41,572) | 93,857 |
Employer contribution | 230 | 16,237 |
Benefits paid | (40,374) | (39,684) |
Fair value of plan assets at end of year | 685,823 | 767,539 | 697,129
Amounts recognized in accumulated other comprehensive losss: |  |  |
Prior service (cost) credit | 0 | 0 |
Net loss | 304,330 | 290,327 |
Accumulated other comprehensive loss at end of year | 304,330 | 290,327 | 311,166
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | (49,449) | (81,529) |
Accumulated other comprehensive loss at beginning of year | 290,327 | 311,166 |
Amount prepaid (accued) at beginning of year | 240,878 | 229,637 |
Net periodic benefit (credit) cost | (5,513) | (4,996) | (6,761)
Additional benefit cost | 0 | 0 |
Contributions | 230 | 16,237 |
Amount prepaid (accrued) at end of year | 235,595 | 240,878 | 229,637
Accumulated other comprehensive loss | (304,330) | (290,327) | (311,166)
Net (liabilities) assets at end of year | (68,735) | (49,449) | (81,529)
OPEB Plan |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 170,720 | 162,365 |
Service cost | 1,028 | 1,026 | 1,156
Interest cost | 5,562 | 5,703 | 6,021
Termination benefit cost | 1,790 | 0 | 0
Actuarial loss (gain) | (20,547) | 6,983 |
Benefits paid | (5,138) | (5,357) |
Benefit obligation at end of year | 153,415 | 170,720 | 162,365
Change in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contribution | 5,138 | 5,357 |
Benefits paid | (5,138) | (5,357) |
Fair value of plan assets at end of year | 0 | 0 | 0
Amounts recognized in accumulated other comprehensive losss: |  |  |
Prior service (cost) credit | 0 | (3,470) |
Net loss | 5,720 | 27,549 |
Accumulated other comprehensive loss at end of year | 5,720 | 24,079 | 13,865
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | (170,720) | (162,365) |
Accumulated other comprehensive loss at beginning of year | 24,079 | 13,865 |
Amount prepaid (accued) at beginning of year | (146,641) | (148,500) |
Net periodic benefit (credit) cost | (4,402) | (3,498) | (4,476)
Additional benefit cost | (1,790) | 0 |
Contributions | 5,138 | 5,357 |
Amount prepaid (accrued) at end of year | (147,695) | (146,641) | (148,500)
Accumulated other comprehensive loss | (5,720) | (24,079) | (13,865)
Net (liabilities) assets at end of year | $ (153,415) | $ (170,720) | $ (162,365)

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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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